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That depends on which property of the water you need to measure.
-- Its temperature . . . degrees Celsius or Fahrenheit.
-- Its volume . . . liter or fluid ounce.
-- Its weight . . . Newton or pound.
-- Its mass . . . kilogram or pound.
-- Its conductivity . . . Siemens.
-- Its depth . . . inch or centimeter.
-- Its clarity or purity . . . I don't know units for either of those, but my only point
is that you don't "measure water" . . . you measure its properties.
What else can I help you with?
Which customary unit of measure would you use to estimate the amount of water in an aquarium?
I am guessing you can use Gallons.
What is the water in they aquarium cm dm m km kg or l?
The unit of measure here would probably be l, for liters.
Which unit would you use to measure the water in a full bathtub?
Which unit would you use to measure the water in a full tub?
What unit of measure would you use to measure water in a bathtub?
Gallons
What unit of measure would you use to measure the capacity of a water cooler?
Litres
Which customary unit of measure would you use to estimate the amount of water in an aquarium?
I am guessing you can use Gallons.
What is the water in they aquarium cm dm m km kg or l?
The unit of measure here would probably be l, for liters.
What metric unit would you use to measure the capacity of an aquarium?
Liters would be easiest to use.
What is the best metric unit to measure the amount of water in the pool?
Litres for a domestic aquarium, kilolitres for a large [public] aquarium.
Which unit would you use to measure the water in a full bathtub?
Which unit would you use to measure the water in a full tub?
What metric unit is used to measure water in a fish tank?
Measure its dimensions in inches or centimeters, and its volume or capacity in gallons or litres.
What is the best unit to measure the amount that would fill a big aquarium gallons or kilograms or cups?
Gallons.
What unit of measure would you use to measure water in a bathtub?
Gallons
Which metric unit would you use to measure the capacity of a hot water tank?
You would use the metric unit "liters" to measure the capacity of a hot water tank.
Which SI units would you use to measure the amount of salt water in an aquarium the mass of a rock and density of a rock?
If you are trying to measure concentration of salt in water you would be measuring molarity which is moles / liter. Moles are equal to grams of salt / the MW of salt (and if you mean NaCl then the MW is 58.44 g/mol). Density is a ratio of mass to volume (mass / volume or kg/m^3)
What unit would you to measure the amount of water in a lake?
gallons
What would be the right unit to measure of water in a pitcher?
Litre
